How to reproduce the error

1. Clone this repository.

npm run install

npm run dev # You can start development server without any error.

npm run type-check # You get three errors!

Estimated cause

Current contents of core/typings/javascript.d.ts are shown below:

import * as Blockly from './core';
export = Blockly.Generator;

This means that, when you import 'blockly/javascript', its type is treated as typeof Blockly.Generator. However, javascript.js exports Blockly.JavaScript, which is an instance of Blockly.Generator.

Suggested fix

That type declaration should be changed to the one below:

import * as Blockly from './core';
declare var tmp:Blockly.Generator;
export = tmp;

to export an instance of Blockly.Generator instead of typeof Blockly.Generator.

• Note that there remains two errors after above fix.
  • These might require breaking change to fix, so these are rather a feature request than a bug.
  • One is because constants ORDER_* does not exists in class Blockly.Generator.
    • I know this is hard to fix, because they are defined for each instance of Blockly.Generator.
    • One suggested fix is move ORDER_* to Blockly.Generator.ORDER.*, where ORDER has index signature type Object.<string, number>.
  • The other is because property {user_defined_block_name} does not exists in class Blockly.Generator.
    • I know this is hard to fix, because they are defined in each local projects.
    • One suggested fix is add function below to Blockly.Generator:

    registerCodeGeneratorForBlock(blockName:string,codeGeneratorFunc:(block:Blockly.Block)=>string|[string,number])

    which simply assign given function to this[blockname].
  • My fork of blocklyincludes these changes.